Back plate for lighting fixture



FIG. 1 is a front elevational view of a back plate for lighting fixture, showing my new design, the rear surface being flat;

FIG. 2 is a side elevational view thereof, the opposite elevational view being a mirror image; and,

FIG. 3 is a top plan view thereof, the bottom plan view being a mirror image. 

The ornamental design for a back plate for lighting fixture, as shown and described. 